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Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms

Aperiodic sparse 2D ultrasonic array configurations, including random array, log spiral array, and sunflower array, have been considered for their potential as conformable transducers able to image within a focal range of 30–80 mm, at an operating frequency of 2 MHz. Optimisation of the imaging perf...

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Autores principales: Li, Xiaotong, Gachagan, Anthony, Murray, Paul
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7570994/
https://www.ncbi.nlm.nih.gov/pubmed/32961726
http://dx.doi.org/10.3390/s20185370
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author Li, Xiaotong
Gachagan, Anthony
Murray, Paul
author_facet Li, Xiaotong
Gachagan, Anthony
Murray, Paul
author_sort Li, Xiaotong
collection PubMed
description Aperiodic sparse 2D ultrasonic array configurations, including random array, log spiral array, and sunflower array, have been considered for their potential as conformable transducers able to image within a focal range of 30–80 mm, at an operating frequency of 2 MHz. Optimisation of the imaging performance of potential array patterns has been undertaken based on their simulated far field directivity functions. Two evaluation criteria, peak sidelobe level (PSL) and integrated sidelobe ratio (ISLR), are used to access the performance of each array configuration. Subsequently, a log spiral array pattern with −19.33 dB PSL and 2.71 dB ISLR has been selected as the overall optimal design. Two prototype transducers with the selected log spiral array pattern have been fabricated and characterised, one using a fibre composite element composite array transducer (CECAT) structure, the other using a conventional 1–3 composite (C1–3) structure. The CECAT device demonstrates improved coupling coefficient (0.64 to 0.59), reduced mechanical cross-talk between neighbouring array elements (by 10 dB) and improved operational bandwidth (by 16.5%), while the C1–3 device performs better in terms of sensitivity (~50%). Image processing algorithms, such as Hough transform and morphological opening, have been implemented to automatically detect and dimension particles located within a fluid-filled tube structure, in a variety of experimental scenarios, including bespoke phantoms using tissue mimicking material. Experiments using the fabricated CECAT log spiral 2D array transducer demonstrated that this algorithmic approach was able to detect the walls of the tube structure and stationary anomalies within the tube with a precision of ~0.1 mm.
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spelling pubmed-75709942020-10-28 Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms Li, Xiaotong Gachagan, Anthony Murray, Paul Sensors (Basel) Article Aperiodic sparse 2D ultrasonic array configurations, including random array, log spiral array, and sunflower array, have been considered for their potential as conformable transducers able to image within a focal range of 30–80 mm, at an operating frequency of 2 MHz. Optimisation of the imaging performance of potential array patterns has been undertaken based on their simulated far field directivity functions. Two evaluation criteria, peak sidelobe level (PSL) and integrated sidelobe ratio (ISLR), are used to access the performance of each array configuration. Subsequently, a log spiral array pattern with −19.33 dB PSL and 2.71 dB ISLR has been selected as the overall optimal design. Two prototype transducers with the selected log spiral array pattern have been fabricated and characterised, one using a fibre composite element composite array transducer (CECAT) structure, the other using a conventional 1–3 composite (C1–3) structure. The CECAT device demonstrates improved coupling coefficient (0.64 to 0.59), reduced mechanical cross-talk between neighbouring array elements (by 10 dB) and improved operational bandwidth (by 16.5%), while the C1–3 device performs better in terms of sensitivity (~50%). Image processing algorithms, such as Hough transform and morphological opening, have been implemented to automatically detect and dimension particles located within a fluid-filled tube structure, in a variety of experimental scenarios, including bespoke phantoms using tissue mimicking material. Experiments using the fabricated CECAT log spiral 2D array transducer demonstrated that this algorithmic approach was able to detect the walls of the tube structure and stationary anomalies within the tube with a precision of ~0.1 mm. MDPI 2020-09-19 /pmc/articles/PMC7570994/ /pubmed/32961726 http://dx.doi.org/10.3390/s20185370 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Xiaotong
Gachagan, Anthony
Murray, Paul
Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms
title Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms
title_full Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms
title_fullStr Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms
title_full_unstemmed Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms
title_short Design of 2D Sparse Array Transducers for Anomaly Detection in Medical Phantoms
title_sort design of 2d sparse array transducers for anomaly detection in medical phantoms
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7570994/
https://www.ncbi.nlm.nih.gov/pubmed/32961726
http://dx.doi.org/10.3390/s20185370
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